Roll grinding machine

ABSTRACT

D R A W I N G A GRINDING MACHINE PROVIDED WITH A DETACHABLE ASSEMBLY FOR SUBSTITUTING A GROOVING CUTTER FOR A GRINDING WHEEL AND DRIVING THE CUTTER FROM THE GRINDING WHEEL SPINDLE. DRIVE MEANS ARE ALSO PROVIDED FOR SYNCHRONIZING MOVEMENT OF THE GRINDING WHEEL CARRIAGE WITH ROTATION OF THE ROLL TO BE GROOVED.

March 1971 G; v. HULTGREN E 3,556,515

ROLL GRINDING MACHINE Filed March 8, 1968 4 Sheets-Sheet l INVENTORSGunncxY V. HUN \qwm l5.

qvcn ZlKm as Donodd 3' cosxeMo Dufio M2 Wk ATTOR EYS March 2, 1971 GQv.HULTGIRQIIEN EYT AL I ROLL GRINDING MACHINE 4 Sheets-Sheet 3 Filed March5, 195a INVENTORS v J 79% A IHIIHH I eunhav vMufl' mn PHvm A. ZxKOuFQSDonoAd 5 'Cos+e\\ o ROLL GRINDING MACHINE 4 Sheets-Sheet 4 Filed Marcha, 1968 INVENTORS V- uHqren 3- Z\Km*o-s D dd 5; .Cbs-\'c \0 6 unnq mvm62d BY v Dela" M9 IWMQKORN YS United States Patent Offioe 3,566,515Patented Mar. 2, 1971 U.S. Cl. 29-560 6 Claims ABSTRACT OF THEDISCLOSURE A grinding machine provided with a detachable assembly forsubstituting a grooving cutter for a grinding wheel and driving thecutter from the grinding wheel spindle. Drive means are also providedfor synchronizing movement of the grinding wheel carriage with rotationof the roll to be grooved.

This invention relates to roll grinding machines and more particularlyrelates to roll grinding machines having capability for grooving rolls.

In the paper-making industry in many applications rubber covered rollsare used in de-watering of paper products. It has been found that inmany cases by grooving these rubber covered rolls they are much moreeflicient in removing water than the use of a plain rubber covered rollwith a smooth surface.

This invention provides a new and improved mechanism in a. roll grindingmachine to synchronize the longitudinal movement of circular cutters forgrooving roll with rotation of the roll and further provides a new andimproved grooving cutting apparatus which may be substituted on thewheel head for the grinding wheel with great facility. Thus, withapparatus embodying the invention the roll may be finish ground. Thenthe grinding wheel is removed and a grooving cutter attachmentsubstituted therefor. The wheel head carrying the grooving cutter isthen synchronized in longitudinal motion along the length of the rollwith rotation of the roll itself.

An object of this invention is to provide new and improved apparatus forgrooving the face of a calender roll.

Another object of this invention is to provide a new and improvedgrooving attachment which may be substituted for a grinding wheel.

A further object of this invention is to provide new and improved meansfor longitudinally moving a grooving cutter along the face of a calenderroll in synchronizing with the rotation of the roll.

The features of the invention which are believed to be novel are setforth with particularity and distinctly claimed in the concludingportion of the specification. However, the invention both as to itsoperation and organization, together with further objects and advantagesthereof, may best be appreciated by reference to the following detaileddescription taken in conjunction with the drawings, in which:

FIG. 1 is an elevation of a grinding machine embodying the invention;

FIG. 2 is a view seen in the plane of lines 22 of FIG. 1 and partiallycut away in section;

FIG. 3 is an enlarged view of the drive mechanism of FIG. 1 andpartially cut away to illustrate the drive mechanism;

FIG. 4 is an enlarged view of a portion of the grinding wheel head shownin FIG. 2 with the grinding wheel removed and a grooving attachmentmounted to the grinding wheel head;

FIG. 5 is a plan view of the apparatus of FIG. 4;

FIG. 6 is a sectional view seen in the plane of lines 66 of FIG. 4;

FIG. 7 is a view seen in the plane of lines 77 of FIG. 6;

FIG. 8 is a schematic diagram of an electrical control circuit utilizedin conjunction with the disclosed apparatus; and

FIG. 9 is a view in enlarged section of a portion of the machine shownin FIGS. 1 and 2.

The invention may be embodied in a grinding machine 10 of the typeadapted to have two wheels grind a calender roll. The grinding apparatusgenerally comprises a bed or base 11 having neck rests 12 and 12amovable along the lengh thereof on ways provided therefor (not shown).The neck rests 12 and 12a are arranged to support a calender rollthereon which may be of the type having a rubber coating or layer 13thereon. The roll is rotatably driven through a headstock motor 14 andsuitable gearing which is mounted upon a base 15. The drive meansfurther includes a drive shaft 16 connected to one end of roll R.

A carriage 17 moves along the length of bed 11 on ways 18 and 19. Themachine illustrated is of the swing rest type wherein a swing rest 20 issupported on carriage 17 by means of links 21 connected to the upperpart of carriage 17 at 22 and the lower portion of swing rest at 23.This swing rest arrangement reduces to a minimum small inaccuracieswhich may be imparted to the roll from a variety of causes, such asuneven settling of the machine foundation, warpage of the bed due toseasoning, distortions in the machine caused by changes in temperatures,etc.

Carried on swing rest 21 on opposite sides of a roll mounted to neckrests 12 and 12a are sub-carriages 24 and 25, each movable toward andaway from a roll R on ways (not shown). A typical way construction formovement of the sub-carriage toward and away from the axis of rotationof a roll is shown in US. Pat. Re. 25,794. Wheel heads 26 and 27 aremounted to each of sub-bases 24 and and are pivotal thereon as shown at28 to permit tilting infeed and outfeed of the grinding wheel heads.

The carriage 17 carries thereon a traveling nut 29 which threadablyreceives traverse screw 30 supported on base 11. Upon rotation of leador traverse screw 30, nut 29 moves along the length thereof carryingcarriage 17 therewith.

Reference is now made to FIG. 3. The roll driving assembly includes ayoke which connects the spindle 36 of the headstock to driving shaft 16.Driving shaft 16 is in turn connected through a yoke 38 to a yokeadaptor 39 which in turn includes a dog 40 adapted to receive the end ofa journal of roll R and rotate roll R on journal rests 12 and 12a.Mounted to the headstock structure is a support member in the form of agear case 41 which rotatably supports an idler spur gear 42 on a shaft43 by means of bearing assemblies 44. Spur gear 42 is driven by a drivegear 45 mounted to spindle 36. Idler gear 42 further engages a drivengear 47 rotatably mounted to the end portion 48 of a shaft 49 by meansof bearing assemblies 50. Shaft 49 is further rotatably supported incase 41 by bearing assemblies 51. Gear 47 carries thereon a clutchadaptor 52 to which is mounted a clutch 53 positioned about shaft 48.Clutch 53 is of the electrically actuated type. When the drive 54 anddrive 55 elements are engaged gear 47 is non-rotatable with respect toshaft 49, and will drive shaft 49. If clutch elements 54 and 55 are notengaged gear 47 will merely rotate about shaft 49 on bearing assemblies50.

The other end of shaft 49 is rotatably mounted in a gear case 56 andcarries thereon a gear 57. Gear 57 engages a gear 58 on the end of shaft59 which includes traverse screw 30. Shaft 59 is supported on bed 11 asshown at 60. Shaft 59 is connected at the end thereof to the drivenelement 61 of a coupling member 62. The driving element 63 of coupling62 is rotatably mounted to shaft 64 driven by a motor 65 through a gearbox 66. A clutch 67 having a driving member 68 on shaft 64 iselectrically actuated to engage a driven member 69- connected tocoupling member 63.

At this point it may be noted that if clutch 53 is engaged and clutch 67disengaged, shaft 49 drives shaft 59 and traverse screw 30 through gears57 and 58. When clutch 53 is disengaged and clutch 67 engaged, shaft 59and traverse screw 30 will be driven from motor 65 and gear box 66. Inthis manner, the movement of the carriage 17 along ways 18 and 19 may besynchronized with the speed of rotation of roll R.

Reference is again made to FIGS. 1 and 2. Each grinding wheel 78 isnormally driven by a motor 70. Each motor 70 has a pulley 71 on theshaft thereof and idler pulleys 72, 73 and 74 define a path for a drivebelt 75. The belt 75 passes about a pulley 7-6 at one end of thegrinding wheel spindle 77 and the grinding wheel 78 is mounted to theother end of the spindle.

Each grinding wheel is received within a housing 79 which is shown inFIG. 2 with its cover removed. The grinding wheel end of spindles 77 aretapered (FIG. to receive the grinding wheel thereon. When it is desiredto arrange the grinding machine for grooving the wheel guard cover (notshown) is removed from the grinding wheel housing 79 and then nut 81 isremoved from the threaded end of the spindle and the grinding wheelremoved.

At this time, a cutter head assembly 82 (FIGS. 4 and 5) is mounted togrinding wheel head 26 and is adapted to be driven through spindle 77.Cutter head assembly 82 comprises a housing member 83 which rotatablymounts therein a shaft 84. Mounted to shaft 84 are pulleys 85 and 86.Assembly 82 is mounted directly to grinding wheel guard or housing 79 asby means of a plurality of bolts 82a which are received through mountingarms or flanges 82b extending from housing in the existing bolt holesfor the removed cover plate.

When this change in the mode of operation is to occur, a spindle pulley87 is placed on the tapered end of spindle 77 and pulleys 85 and 87 areconnected by an endless timing belt 88. When motor 70 drives spindle 77,pulley 85 drives shaft 84 and in turn pulley 86. Mounted to housing 83and included within assembly 82 is a housing 89 for a cutter spindle 90.Spindle 90 receives on the end thereof a timing pulley 91 which isconnected to timing pulley 86 by means of an endless timing belt 92. Theback side of belt 92 passes beneath a tension-adjusting pulley 93carried on an adjustable arm 94 extending from a bracket 95 adjustablymounted to housing 83. Spindle housing 89 is secured to housing 83 by aplurality of bolts 96 received in oversized passages 97 in the flanges98 on housing 89.

The cutter head is mounted to spindle 90 as by means of a collar 99 andnut 100 threadably received on the end of spindle 90. The cutter headmay carry a plurality of cutters 101 adapted to groove the surface ofroll R.

In operation, when spindle 77 is driven, pulley 85 drives shaft 84 whichin turn drives pulley 86, timing belt 88 and timing pulley 91. Thecutters are then rotated and will cut into the surface or rubber coatingon roll R as carriage 17 moves along the length of bed 11. By virtue ofthe couplings previously described, the carriage moves at a speedsynchronized with rotation of the roll so that the grooves defined inthe surface of the roll have a predetermined pitch.

Spindle housing 89 has an annular projection 102 thereon which isreceived in a mating socket 103 defined in an adjusting block 104 havingupper and lower inclined surfaces 105 and 106 defining a longitudinalslot in housing member 83. This longitudinally extending slot provides amounting means for housing 89. Adjusting block 104 is received inhousing 83 as shown more clearly with respect to housing 83 by means ofa bolt 109a car-.

ried in bracket 108. Bracket 108 is carried on block 104 by means ofbolts 109. Block 104 is so positionable to allow the introduction of thegrooving cutters at the proper lead position into a previously groovedroll.

Spindle housing 89 together with spindle therein is adapted to havelimited rotational movement about the axis of projection 102 in socket103. Such rotational motion is provided as a means for inclining theangle of the cutter blades 101 to give a predetermined degree of lead tothe spiral grooves defined on a roll R. To provide a predetermineddegree of tilt, the bolts 96 are loosened in their oversized apertures.The spindle head may now be tilted to a calibrated position by means ofan assembly shown in FIGS. 6 and 7. An adjusting screw or bolt 110having a cylindrical shank portion 111 is received in flanged bearings112 disposed within a bushing 113 in a bore in adjusting block 104. Theflanged bearings are retained in position between the head of bolt 110and a nut 110a threadably received on threaded portion 114 of adjustingbolt 110. The threaded portion 114 is further received in an adjustingnut 115 which is connected as by means of a pin 116 to a block 117secured to the underside of spindle head 89 as by means of bolts 118.

When adjusting bolt 110 rotated, it will produce longitudinal motion inadjusting nut 115 inasmuch as nut 115 cannot rotate because of the pinconnection to block 117. Such longitudinal motion of nut 115 producessimilar longitudinal motion of block 117 which results in a torque onspindle head 89 about the center of projection 102. The head of nut 110may-be calibrated as shown in FIG. 6 in degrees or fractions thereof topermit the operator to set the desired pitch of the spindle head 89 andhence the cutter blades 101.

It may thus :be seen that the cutter head assembly may be mounted to thegrinding machine in place of a grinding wheel with great facility anddriven directly from the grinding wheel spindle. Moreover, the spindleitself may be adjusted longitudinally with respect to the cutter headassembly as by means of bolt 109a, and may be pitched by means of thepitch or helix adjusting mechanism of FIG. 6.

The engagement of clutches 53 and 62 are controlled by their coils 53dand 62d, respectively, which may be selectively energized through lines120 and 121 (FIG. 8) and commutator and brush assemblies (not shown).The energization of the clutches is controlled by relays 53a and 62awhich are also connected across lines 120 and 121. When switch 122 is ina first position indicated at G, relay 53a in line 123 is energized.When relay 53a is energized it drops out its contact 53b in line 124 toprevent energization of clutch 67 and picks up its contact 53c in lines120 and 121 to energize coil 53d. When this occurs, clutch 53 is engagedand shaft 49 is driven from spindle 36 and, in turn, through gears 57and 58 drives shaft 59. At this time the traverse of the grinding wheelcarriage 17 along bed 11 is synchronized with the rotation of driveshaft 16 and, hence, roll R.

When the machine is to be operated solely in the grind ing mode theswitch 122 is thrown to the terminal or position marked C. This willopen line 123 and close line 124. At this time relay 62a is energized,it drops out its con tact 62b in line 123 and picks up its contact 626to energize coil 62d. Clutch 62 is engaged and shaft 59 with traversescrew 30 thereon is driven directly from motor 65 and gear box 66.During this operation, clutch 53 is not engaged and shaft 49, which isback driven through gear 57 merely rotates with respect to gear 47 inbearing assembly 51.

The apparatus may also include mechanism for imparting curvilinearmotion to the grinding wheel heads 26 and 27 as they travel along thelength of a roll. As previously pointed out, each grinding wheel head ispivotally mounted to its carriage at 28. The rear end of wheel heads '26and 27 are supported through a cam follower 120 on an eccentricallyadjustable crowning cam 121. Cam 121 has rotatably secured thereinsubstantially diametrically thereacross a lead screw 122. Screw 122carries a cOllar 123 having dimensional graduations thereon, and isthreadably received through shaft 124. One end 125 of screw 122 ishexagonally formed to allow it to be rotated by a wrench or similardevice. Cam 121 is retained in place by a clamping disc 126 and nut 127.Upon rotation of screw 122 the center of cam 121 is displaced withrespect to the axis of shaft 124. Accordingly, cam 121 is made eccentricwith respect to shaft 124 Reference is now made to FIGS. 1 and 2. Shaft124 is rotated with movement of carriage 17 along the bed of the machineby reason of the connection of a pinion 128 to a rack 129 on bed 11. Thepinion 128 is affixed to a shaft 130 which carries thereon a worm (notshown) in engagement with a worm gear 131 on shaft 124. With thisarrangement, when shaft 124 is coaxial with cam 121 rotation of shaft124 will impart no vertical movement to cam follower 120. However, whencam 121 is positioned to be eccentric with respect to shaft 124 movementof the carriage along the bed will impart vertical movement to camfollower 120 and, hence, provide provision for grinding a crown on theroll.

It will be apparent that this control will be utilized with the groovingassembly when a roll to be grooved has previously been provided with acrown.

-It may thus be seen that the objects of the invention set forth aboveas well as those made apparent from the foregoing description areefficiently attained. Other embodiments of the invention andmodifications to the disclosed embodiment thereof which do not departfrom the spirit and scope of the invention may occur to those skilled inthe art. Accordingly, the appended claims are intended to cover allmodifications and embodiments of the invention which do not depart fromthe spirit and scope thereof.

What is claimed is:

1. For use in combination with a roll grinding machine having means forrotatably supporting a roll, first drive means for rotating the roll, abase, a carriage including a grinding wheel head movable along saidbase, second drive means for moving said carriage, said wheel headhaving a power operated spindle normally adapted to receive a grindingwheel thereon: a groove cutting assembly comprising a first housingmember rotatably mounting a shaft therein, at least one grooving cutterthereon, a

second housing member mountable to said wheel head, said second housinghaving power transmission means for connecting said shaft to thespindle, said second housing member having mounting means adapated tomovably mount said first housing member so as to allow selection of thelongitudinal position of said at least one grooving cutter along a rollon the grinding machine.

2. The assembly of claim 1 wherein a slot is defined in said secondhousing member longitudinally with respect to a roll on said machine andslidably receives therein a block carried by said first housing member.

3. The assembly of claim 1 wherein said first housing and second housingare constructed and arranged to permit limited pivotal movement of saidfirst housing with respect to said second housing.

4. The assembly of claim 1 further defined in that said first housingincludes a mounting member received in said mounting means of saidsecond housing, said mounting member having a cylindrical socket definedtherein, said first housing having a cylindrical projection received insaid socket, a plurality of clamping bolts passing through enlargedbores in said first housing member and received in said mounting member,and cooperating means on said mounting member and said first housingmember for imparting pivotal motion to said first housing member withrespect to said mounting member.

5. The assembly of claim 3 wherein said cooperating means comprises ascrew on said mounting member and a nonrotatable nut on said firsthousing member receiving said screw.

6. The combination of claim 1 further including means for disabling saidcarriage drive means and connecting said roll drive means to move saidcarriage in timed relation to rotation of the roll.

References Cited UNITED STATES PATENTS 780,972 1/ 1905 Bowen 51-49X1,227,304 5/ 1917 Pedrick 8283X 2,359,255 9/ 1944 Smith 8221.2X3,088,250 5/1963 Holt et a1 5149 2,641,970 6/1953 Plummer.

2,994,995 8/1961 Grifiith 51-134.5

OTHER REFERENCES 319,685 2/1957 Switzerland 160,959 2/ 1964 U.S.S.R.

ANDREW R. JUHAS, Primary Examiner Z. R. BILINSKY, Assistant Examiner

